Do not try to buy peace by appeasing your abuser. Submissiveness and attempts to reason with him only whet the stalker's appetite. He regards both as contemptible weaknesses, vulnerabilities he can exploit. You cannot communicate with a paranoid because he is likely to distort everything you say to support his persecutory delusions, sense of entitlement, and grandiose fantasies. You cannot appeal to his emotions - he has none, at least not positive ones.
Remember: your abusive and paranoid former partner blames it all on you. As far as he is concerned, you recklessly and unscrupulously wrecked a wonderful thing you both had going. He is vengeful, seething, and prone to bouts of uncontrolled and extreme aggression. Don't listen to those who tell you to "take it easy". Hundreds of thousands of women paid with their lives for heeding this advice. Your paranoid stalker is inordinately dangerous - and, more likely than not, he is with you for a long time to come.
(From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 2 DVDs with 12 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)